How to re-seal the bath

[Sunflower1987]

Evening all
Looking for some DIY advice for a beginner (but generally intelligent-ish & functioning member of society)

Our bath looks like it needs re-sealing. Some of the silicone is looking thin in places, it’s not leaking however it doesn’t look like it’s going to last. Is this something I can do? Any recommendations of products to use/avoid? Any tips? And how do I best remove all traces of the old seal?
Thanks
PS. I already know to fill the bath with cold water... so that’s a start!

Yes to full bath.

Score gently under the old sealant with a stanley knife or razor blade and then peel it away. Apply new sealant and run over it immediately with damp jay cloth to remove any excess and sharpen the edges.

But you probably need @PigletJohn.

If you can't cut all the sealant away, use sealant remover in a little bottle (I got no nonsense stuff from either Screwfix or Wickes I think). When you're ready to smooth it out wet your finger in very soapy water and lightly go over it with a finger. Keep dipping in that soapy water as you go along.

I get a good finish on my silicone and was convinced I was a DIY expert but I've just realised I didn't fill my bath when I did mine a few weeks ago! Doh!

It's quite easy to do. Make sure that you don't cut the nozzle too wide on the sealant tube to start with (as you can cut it wider but can't put it back!) and get one of those metal things which push the sealant down.

Make sure you clean away all the sealant before you start - this can take longer than you might think. Have a good couple of cloths ready to wipe up any bits of sealant that go in the wrong place, and to help get it off you fingers.

Make sure it is completely dry before you use the bath.

YouTube is your friend!

One tip is to make sure your bath is at least part full when you re-apply the new sealant, so you can account for that bit of movement.

Whoops. Just re-read the last sentence of your post sorry OP.